Brake-shoe.



PATENTED MAE. 21, 1905.

No. 785,290. l

. P. CARPENTER.

BRAKE SHOE.

APPLIOATION FILED MAY 3. 1904.

2 SHEETS-SHEET l.

. No. 785,290.- PATENTEE MAR. 21, 1905.

' P. CARPENTER. A

BRAKE SHOE.

APPLIOATION FILED MAY 3. 1904.

' 2 SHEETS-SHEET 2.

UNTTED STATES Patented March 21, 1905.

PATENT EETCEo PAUL CARPENTER, OF CHICAGO` ILLINOIS, ASSIGNOR TOAMERICAN.

BRAKE SHOE 8c FOUNDRY COMPANY, OF JERSEY CITY, NEV J ER- SEY, ACORPORATION OF NEW JERSEY.

BRAKE-SHOE.

SPECIFICATION formingpart of Letters Patent No. '7 85,290, dated March21, 1905.

i Application filed May 3,1904. Serial No. 206,136.

To all, whom it may concern:

Be it known that I, PAUL CARPENTER, a citizen of the United States,residing at Chicago, in the State of Illinois, have invented certain newand useful Improvements in Brake-Shoes, of which the following is aspecification.

My invention relates to the separable Wearing blocks or shoes used uponrailway brakes and the like, and particularly to a style of shoe havinga cast body and a separable binding back of steel fixed thereon as shownin the co-pending applications of Joseph D. Gallagher Nos. 206,134 and206,135, upon which devices the present invention is an improvement. Theobjects of this invention are, to more thoroughly wedge and secure themalleable back upon the cast shoe, to make the parts more convenientlyseparable when desired,'and to generally improve the structure andefficiency of brake shoes with separable binding backs. These objectsand other advantages to hereinafter appear, I attain by means of theconstruction illustrated in preferred forms in the accompanyingdrawings, wherein- Figures l, 2, and 3, are perspective views of thethree parts of the brake shoe made according to my improvements: A

Figure 4 is a central longitudinal section of the shoe and the-partsassembled, and the attaching key in place, the shoe being shown inconnection with a brake head indicated by dotted lines;

Figure 5 is a perspective vieW of a modification in which the back ismade in two pieces;

Figures 6, 7, and 8 are perspective views of the three parts of amodification of the shoe in which the body is provided with an upwardlyprojecting tongue instead of a groove as in Figure 1;

Figure 9 is a central longitudinal section of the assembled shoe similarto that of Figure 4, and

Figure 10 is a perspective view of a modified form of back made in twopieces.

The essential parts of the brake shoe as shown herein are similar tothose set forth in the Gallagher applications above referred to,

save as will herein appear. In those structures Yhowever thetonUue-and-groove connection' between the malleable back and the Ycastbody' of the shoe is dependent somewhat upon the key lug being placed inposition in the notch of the brake head in order to tighten the backinits place on the shoe body. For this purpose both the tongue and groovein those cases are made with the taper toward the center, whereby thetwo movable wings of the back are drawn toward the center in ordertotighten the backupon the body. In this present device I preferably makethe tongueand-groove connection converging from the,

center out toward the end so that the tightening takes place by forcingthe two wings away from each other outward. And in order to hold themtightly in place I provide a fixing key slightly wedge shaped to spreadapart and maintain in place the wings of the back upon the wearingfsole.Thus it will be seen in Figure 1 that I have provided a cast shoe body11 which is provided in the top with a continuous groove 12 havingundercut edges 13, and the groove is convergent both ways from thecenter toward the ends of the shoe. Co-operating with this I provide amalleable steel binding back v14 with the two wings of proper form toco-operate with the groove in the body ofthe shoe, the saine being madeof a steel plate bent up in a loop at the center to form the key lug 15and having at the outer ends upward turned lips 16 to guide the key andprovide a support for the brake head after the shoe is assembled asshown in Figure 4. In. order to thoroughly tighten the back in its placeupon the body, I have provided a cross groove 18 at the'middle of theshoe underneath the lug 15, and co-operating with this I provide thefixing key 19 which is driven therein after the back is placed in thegroove 12 and forces the wings toward the outer end tightening thembetween the undercut edges 13 of the body. Thus when the two parts areassembled as shown in Figure 4, it will be understood that the brakeshoe key 22 passes through the eyes of the brake head 21 and of the lug15, and in the notches shown in the upturned ends 16 of the back. Inorder to more securely guide the ends of the brake head and also toprovide a resilient support for the key 22 I use a pair of co-operatingspurs 17 punched up out of the plate as shown. The fixing key 19 havingbeen driven tightly into place this may be retained if desired by anyconvenient means, such as the pin 20 which is provided in the body 1 1of the shoe, or by splitting and spreading the small end of the key inthe fiared vend of its groove. (Figs. 2 and 3.)

In Figure 5 is shown a slight modification in which the back 14a is-madein two parts instead of a single piece as shown in Figure 1, and theconstruction and the method of assembling is otherwise as before.

In Figures 6 to 10 is shown a modification in which the brake shoe body23 instead of being provided with a groove upon its back surface anupwardly projecting elongated lug or tongue 24 having undercut edges andopening from the-outside and converging from the ends of the shoetowards its center. Co-operating with this the back 25 is made with anopen slot 26 having its edges of proper form to co-act with the lug 24,making a firm tongue-and-groove connection between the back and thebody, when the two side wings of the back 25 are driven apart by theentry of `the fixing key 19 into the groove 18 as heretofore described.The assembled shoe being placed in the brake head 21 as shown in Figure9, the xing key 19 being driven into place may be held therein by thepin 20, and the construction is otherwise as heretofore described. InFigure 10 is shown -a modication in which the back 25at is made in twoarts which have the upward turned ears 15'D ibrming the central key lugas heretofore described, and this is assembled with the body having thetongue 24 as in Figure 7, the construction being otherwise as heretoforedescribed.

It will be understood that in the assembling of parts either in the formof Figure 1 or Figure 6, the sides of the central upward turned loop 15forming the key lug are first brought together'so as to allow of theside wings of the back to fit into the groove 12 in the one case or overthe tongue 24 in the other case, whereupon the wings are spread awayfrom each other and so held by driving in the fixing key 19 and theparts are thereby firmly assembled. It will be seen that the backengages the body of the shoe throughout practically its entire length,and although rmly fixed in place thereon is easily removable bywithdrawing the fixing key 19 and pinching the sides of central loop 15together. It will be clear, of course, that in case the back is made oftwo pieces as in Figures 5 and 10, the wings 14l and 25'r1 respectivelyare simply placed in position on the back and then driven apart' andheld so by the insertion of the fixing key 19. This may be done eitherbefore or after the shoe is put in place in to the brake head,accordingly as desire to secure by Letters Patent, is the following:

1. A brake shoe comprising a body portion and a separable back, the twoparts respectively being provided with co-operating ton ue-and-grooveconnections, and a wedge for g the same in place.

2. A brake shoe having a binding back thereon removably attached bymeansof cooperating wedge-shaped tongue-and-groove connections, and means fortightening and retaining the tongue in place.

3. The combination with a brake shoe body having on each side a pair ofcentrally converging engaging surfaces, and a back having its two wingsmovable with respect to each other, and each provided with a pair ofengaging surfaces to co-operate with said surfaces on the body,substantially as described.

4. A brake shoe comprising a body portion and a removable binding back,the body and back on each side of the center engaging each other byinclined tongue-and-grooves, and a wedge for spreading the two sides ofthe back to engage the body, substantially as described.

5. The combination with a brake shoe body having upon its surface twoundercut grooves converging from the center toward the ends, and a steelback having two wedgeshaped wings movable with respect to each otherlongitudinally of the shoe to engage said grooves, and means forspreading the said two wings.

6. The combination of a shoe body having upon its back a pair ofundercut grooves converging from the center toward the ends, and aconverging cross groove near the center, and a removable binding backengaging said grooves. K

7. The combination with a shoe body having a pair of conver ing undercutgrooves therein, of a removable back comprising a plate with an upturnedbent loop at the center and two wedge-shaped side wings adapted to fitthe grooves of the shoe body, and a wedge for separating the said twowings, substantially as and for the purpose described.

8. The combination with a steel 'back havlOO IlO

ing an upward bent loop at `the vcenter and two wedge-shaped wings, of abody havingon each side of the center an outwardly tapering undercutgroove, and means for spreading and holding the wings of the back insaid grooves. v

9. A brake shoe comprising a back and a body attached to each other byan inclined tongue-and-groove connection and a wedge Jfor xing andretaining the parts together.

10. Abrake shoe comprising a back and a body, means for attaching thesame, and a separate key engaging therewith for retaining the partstogether. v

11. A brake shoe back having at each end a pair of spurs punched out ofthe back to form seats for the key.

12. The combination, with anv attaching key, of a shoe back plate havingat each end a pair of oppositely inclined spurs punched 1(lut of theplate and resiliently engaging the ey. 13. The combination with theattaching key for a brake shoe, of a back plate having at each end apair of equalizing spurs carried by the plate and resiliently engagingthe key whereby the key is irmly held in position.

In testimony whereof Il have hereunder signed my name in the presence ofthe two subscribed witnesses. l

v PAUL CARPENTER. Witnesses:

EDWARD C. BURNS, ALBERT C. HOWARD.

